drivers/usb/dwc3/host.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * host.c - DesignWare USB3 DRD Controller Host Glue
   4  *
   5  * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com
   6  *
   7  * Authors: Felipe Balbi <balbi@ti.com>,
   8  */
   9
  10 #include <linux/acpi.h>
  11 #include <linux/platform_device.h>
  12
  13 #include "core.h"
  14
  15 static int dwc3_host_get_irq(struct dwc3 *dwc)
  16 {
  17         struct platform_device  *dwc3_pdev = to_platform_device(dwc->dev);
  18         int irq;
  19
  20         irq = platform_get_irq_byname_optional(dwc3_pdev, "host");
  21         if (irq > 0)
  22                 goto out;
  23
  24         if (irq == -EPROBE_DEFER)
  25                 goto out;
  26
  27         irq = platform_get_irq_byname_optional(dwc3_pdev, "dwc_usb3");
  28         if (irq > 0)
  29                 goto out;
  30
  31         if (irq == -EPROBE_DEFER)
  32                 goto out;
  33
  34         irq = platform_get_irq(dwc3_pdev, 0);
  35         if (irq > 0)
  36                 goto out;
  37
  38         if (!irq)
  39                 irq = -EINVAL;
  40
  41 out:
  42         return irq;
  43 }
  44
  45 int dwc3_host_init(struct dwc3 *dwc)
  46 {
  47         struct property_entry   props[4];
  48         struct platform_device  *xhci;
  49         int                     ret, irq;
  50         struct resource         *res;
  51         struct platform_device  *dwc3_pdev = to_platform_device(dwc->dev);
  52         int                     prop_idx = 0;
  53
  54         irq = dwc3_host_get_irq(dwc);
  55         if (irq < 0)
  56                 return irq;
  57
  58         res = platform_get_resource_byname(dwc3_pdev, IORESOURCE_IRQ, "host");
  59         if (!res)
  60                 res = platform_get_resource_byname(dwc3_pdev, IORESOURCE_IRQ,
  61                                 "dwc_usb3");
  62         if (!res)
  63                 res = platform_get_resource(dwc3_pdev, IORESOURCE_IRQ, 0);
  64         if (!res)
  65                 return -ENOMEM;
  66
  67         dwc->xhci_resources[1].start = irq;
  68         dwc->xhci_resources[1].end = irq;
  69         dwc->xhci_resources[1].flags = res->flags;
  70         dwc->xhci_resources[1].name = res->name;
  71
  72         xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
  73         if (!xhci) {
  74                 dev_err(dwc->dev, "couldn't allocate xHCI device\n");
  75                 return -ENOMEM;
  76         }
  77
  78         xhci->dev.parent        = dwc->dev;
  79         ACPI_COMPANION_SET(&xhci->dev, ACPI_COMPANION(dwc->dev));
  80
  81         dwc->xhci = xhci;
  82
  83         ret = platform_device_add_resources(xhci, dwc->xhci_resources,
  84                                                 DWC3_XHCI_RESOURCES_NUM);
  85         if (ret) {
  86                 dev_err(dwc->dev, "couldn't add resources to xHCI device\n");
  87                 goto err;
  88         }
  89
  90         memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props));
  91
  92         if (dwc->usb3_lpm_capable)
  93                 props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb3-lpm-capable");
  94
  95         if (dwc->usb2_lpm_disable)
  96                 props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb2-lpm-disable");
  97
  98         /**
  99          * WORKAROUND: dwc3 revisions <=3.00a have a limitation
 100          * where Port Disable command doesn't work.
 101          *
 102          * The suggested workaround is that we avoid Port Disable
 103          * completely.
 104          *
 105          * This following flag tells XHCI to do just that.
 106          */
 107         if (DWC3_VER_IS_WITHIN(DWC3, ANY, 300A))
 108                 props[prop_idx++] = PROPERTY_ENTRY_BOOL("quirk-broken-port-ped");
 109
 110         if (prop_idx) {
 111                 ret = platform_device_add_properties(xhci, props);
 112                 if (ret) {
 113                         dev_err(dwc->dev, "failed to add properties to xHCI\n");
 114                         goto err;
 115                 }
 116         }
 117
 118         ret = platform_device_add(xhci);
 119         if (ret) {
 120                 dev_err(dwc->dev, "failed to register xHCI device\n");
 121                 goto err;
 122         }
 123
 124         return 0;
 125 err:
 126         platform_device_put(xhci);
 127         return ret;
 128 }
 129
 130 void dwc3_host_exit(struct dwc3 *dwc)
 131 {
 132         platform_device_unregister(dwc->xhci);
 133 }